<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
            <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="" :show-row-hover="false">
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
                    <i class="el-icon-error" v-else style="color: red;"></i>
                </template>
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                    <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                    <el-tag type="warning" size="mini" v-else>三级</el-tag>
                </template>
                <template slot="opt" slot-scope="scope">
                    <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditCate(scope.row.cat_id)">编辑</el-button>
                    <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeCate(scope.row.cat_id)">删除</el-button>
                </template>
            </tree-table>
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="queryInfo.pagenum"
                :page-sizes="[4, 8, 12, 16]"
                :page-size="queryInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total">
            </el-pagination>
        </el-card>
        <el-dialog
            title="添加分类"
            :visible.sync="addCateDialogVisible"
            width="50%" @close="addCateDialogClosed">
            <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
                <el-form-item label="分类名称：" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类：">
                    <el-cascader
                        expandTrigger="hover"
                        v-model="seletedKeys"
                        :options="parentCateList"
                        @change="parentCatchChange" :props="cascaderProps" clearable props.expandTrigger="hover" change-on-select></el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>
        <el-dialog
            title="修改分类"
            :visible.sync="editCatDialogVisible"
            width="50%"
            @close="editDialogClosed">
            <el-form :model="editForm" ref="editCateRef" label-width="100px">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="editForm.cat_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editCatDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editCate">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data () {
        return {
            catelist: [],
            queryInfo: {
                type: 3,
                pagenum: 1,
                pagesize: 5
            },
            total: 0,
            columns: [{
                label: '分类名称',
                prop: 'cat_name'
            }, {
                label: '是否有效',
                type: 'template',
                template: 'isok'
            }, {
                label: '排序',
                type: 'template',
                template: 'order'
            }, {
                label: '操作',
                type: 'template',
                template: 'opt'
            }],
            addCateDialogVisible: false,
            addCateForm: {
                cat_name: '',
                cat_pid: 0,
                cat_level: 0
            },
            addCateFormRules: {
                cat_name: [
                    { required: true, message: '请输入分类名称', trigger: 'blur' }
                ]
            },
            parentCateList: [],
            cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            seletedKeys: [],
            editCatDialogVisible: false,
            editForm: {}
        }
    },
    created () {
        this.getCateList()
    },
    methods: {
        async getCateList () {
            const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
            if (res.meta.status !== 200) return this.$message.error('商品列表获取失败！')
            this.catelist = res.data.result
            this.total = res.data.total
        },
        handleSizeChange (newSize) {
            this.queryInfo.pagesize = newSize
            this.getCateList()
        },
        handleCurrentChange (newPage) {
            this.queryInfo.pagenum = newPage
            this.getCateList()
        },
        showAddCateDialog () {
            this.getParentCateList()
            this.addCateDialogVisible = true
        },
        async getParentCateList () {
            const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
            if (res.meta.status !== 200) return this.$message.error('父级分类数据获取失败！')
            this.parentCateList = res.data
        },
        parentCatchChange () {
            if (this.seletedKeys.length > 0) {
                this.addCateForm.cat_pid = this.seletedKeys[this.seletedKeys.length - 1]
                this.addCateForm.cat_level = this.seletedKeys.length
                return this.addCateForm
            } else {
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
        addCate () {
            this.$refs.addCateFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post('categories', this.addCateForm)
                if (res.meta.status !== 201) return this.$message.error('分类添加失败！')
                this.$message.success('分类添加成功！')
                this.getCateList()
                this.addCateDialogVisible = false
            })
        },
        addCateDialogClosed () {
            this.$refs.addCateFormRef.resetFields()
            this.seletedKeys = []
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0
        },
        async removeCate (id) {
            const confirmResult = await this.$confirm('是否删除该分类？', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消'
            }).catch(err => err)
            if (confirmResult !== 'confirm') return this.$message.info('取消删除')
            const { data: res } = await this.$http.delete(`categories/${id}`)
            if (res.meta.status !== 200) return this.$message.error('删除分类失败！')
            this.$message.success('删除成功！')
            this.getCateList()
        },
        async showEditCate (id) {
            const { data: res } = await this.$http.get(`categories/${id}`)
            if (res.meta.status !== 200) return this.$message.error('分类查询失败')
            this.editForm = res.data
            this.editCatDialogVisible = true
        },
        editCate () {
            this.$refs.editCateRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put('categories/' + this.editForm.cat_id, {
                    cat_name: this.editForm.cat_name
                })
                if (res.meta.status !== 200) return this.$message.error('分类信息更新失败！')
                this.editCatDialogVisible = false
                this.getCateList()
                this.$message.success('分类信息更新成功！')
            })
        },
        editDialogClosed () {
            this.$refs.editCateRef.resetFields()
        }
    }
}
</script>

<style lang="less" scoped>
    .treeTable {
        margin-top: 15px;
    }

    .el-cascader {
        width: 100%;
    }
</style>
